Ilshedlock



(No Model.) 2 Sheets-Sheet 1.

A. SHEDLOCK.

ROCK DRILL.

,Wil/temes SHEDLOCK.

ROCK DRILL. v No. 285,516. 8 y Patented Sept. 25, 1883.

(No Model.) 2 SheetsSheet 2.

N. razas. Phoeeumogmpw. wnhingwn. n. c

' NITED STATESV PATENT Orifice.

ALFRED SHEDLOOK, `OF BROOKLYN, NEYV YORK.

`ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 285,516, datedSeptember 25, 183.

Application filed October 14, 1882. (No model.) v

To aZZ whom it may concern Be it known that I, ALFRED SiinDLooK, ofBrooklyn, county of Kings, State of N ew York, have invented certain newand useful Improvements in Rock-Drilling Machines, of which thefollowing is a specication.

This invention relates to hand-power rockdrilling machines, andparticularly to improvements in the construction of the various parts ofthe machine patented February 28, 1882, and numbered 254,398.

Figure 1, Sheet 1, represents a longitudinal sectional elevation of themachine. Fig. 2, Sheet 2, is a plan view 'of themsame. Fig. 3, Sheet 1,is a transverse section through the line Fig. 4, Sheet 1, is atransverse section through the line y y. Fig. 5, Sheet 1, is a sectionof the upper part lof rear supportinglegs. Fig. 6, Sheet 1, is atransverse section of one of the legs. Fig. 7, Sheet 1, is an end viewofthe drill-chuck open. Fig. S, Sheet 2, is a transverse section on theline z z, Fig.

2. Fig. 9, Sheet 2, is a view ofthe front leg,

detached from the machine; and Fig. 10, Sheet 2, is a side view of partof the body, showing the protecting-covers.

The machine described in the before-mentioned Patent No. 254, 393 andthe present invention are similar as regards the relative positions ofthe various devices and general construction, so I only deem itnecessary to describe such parts as show novelty in construction andcombination, and to facilitate comparison of the two inventions, similarletters of reference are employed to indicate corre- The body of themachine c c c2 c"5 c, the frame a d a2 (6*, the cams Z Z, the hammer m mm2, with solid bearing-faces m m for the cams Z Z, instead of rollers,the spring 1, the plunger f feed-screw (Z cZ, and nut-frame c areconstructed substantially as Vshown in the before-mentioned LettersPatent, so further reference to the same here is unnecessary.

The improvements in the adjustable supportin g-legs consist in makingthe upper part ofeach 4 of the two rear legs, b b, with asemi-cylindrical groove and socket at the lower ends, in and throughwhich slide longitudinally the lower rods, b b, provided at their upperends with the clamps b2 b2, shap ed so as to pass around the parts b b,and havingthumb-screws b3 b3, adaptedto be set in the notches b4 b4, tohold the parts firmly .together when the legs are once adjusted to Awith the nut b5. Under the head of the clamping-bolt, and under the nutb5, are placed spherical washers, which lit the concave sides of thecups on the ends of the parts b b. By this arrangement both of the rearlegs may be set in any desired position and clamped lrigidly to.

the frame by means of the one clamping-bolt and nut b5.

The front leg is shown in Figs. 1 and 4, consisting of a tube, b, andeXtensible rod bl; but in practice it is preferable to construct thispart of the leg similar to the rear legs, as shown in Fig. 9, -with thesemi-cylindrical part, having a screw-thread formed thereon in place ofthe spherical cup, which screw-thread ts in the socket of the yoke bs,and in the bifurcated part of this yoke are placed the two washers b,through which and the arms of the yoke is passed the bolt bw. Thewashers have slots and the bolt has pins, by which means they are causedto turnin the yoke together, and a hole is' formed through them to admitthe end of the pointed side bar, a', or the stud a* of the frame, thehole in thebolt being larger than the bar a" or stud a2 lso that whenthe nut on the bolt Z110 is screwed up the washers Zf are caused toclamp the rod a or stud a4, preventing the leg from rotating thereon,andthe inner sides of the yoke embrace firmly the sides of the washers,preventing the leg from turning on the bolt bw. By this construction it'is seen that this leg may be adjusted and clamped in any `desiredposition, either on the bar a or stud a4, and the front end ofthe frameforced against the rock by means of the screw-thread on the end ofsemicylindrical-grooved part.

The plunger f is constructed and actuated substantially as described inthe before-men- IOO 'part of the body c.

tioned Letters Patent. Its end passes through the cylindrical part h2 ofthe sliding head l1., and the compensating-spring h* is placed over thereduced portion of it inside the head 71,. On the extreme end'is screwedthe socket n', which receives the blows of the hammer mf, instead ofbeing screwed into the spindle, as heretofore. This blow-receivingsocket holds the worm-wheel j against a shoulder on the spindle, theworm-wheel and socket being secured together by means of a dowel-pin, sothat the whole rotates together when the wormwheel j is actuated bymeans of the worm-cam j. The Aworm-wheel j and socket n may be made ofone piece of metal, if desired.

The improvement in the sliding head 7L and its actuating-cams consistsin making the horns or bearers h2 7b3 and the cams i so that eachworking-point of the cams works against the horns h2 h alternately, andso imparts to the sliding head the required reciprocating movement twiceto each revolution of the main shaft z'. These parts are hereby mademuchstronger, having twice as wide bearing-surfaces as heretofore, withoutnecessitating any increase in their sizes. The main shaft t' is providedwith splines, which fit into keyways cut in the cams t Z Z. The hubs ofthevcams Z Z have clutch-teeth formed thereon,into which interlockcorresponding clutch-teeth, formed on the hubs of the handles k k, saidhandles being held on the shaft i. by means of split pins.

The feeding device consists ofthe bell-crank leveror pawl eZ, supportedou the shaft (Z5, which has bearings in the sides ofthe box The lowerend, f, of this pawl d fits into the annular groove formed in theplunger f, and theother end, dt; is shaped so as to catch over the teethof the ratchetwheel Z2 on the end of the feed-screw d. The spring (Z6 onthe shaft (Z5 forces the pawl over the edge of the tooth of the ratchetwhen the end d* moves up sufficiently high to clear the edge of thetooth. This only takes place when the plunger makes its full stroke, forwhen the drill strikes the rock the compensating-spring 71.* is slightlycompressed, and the plunger j" does not move forward its full limituntil the hammer m has driven the drill sufficiently into the rock, andwith certain kinds of rocks several blows of the hammer are required tocause the drill to cut as far as the body is fed forward for eachmovement of atooth of the ratchet-wheel (Z2. The ratchetwheel (Z`Z isprevented from turning backward by means of the flat spring (ZT, whichis placed in the corner of the box part of the body, as shown at Figs. 2a-nd 3.

It was .suggested in the before-mentioned Letters Patent No. 254,393that the principal working parts could be protected by covers. Thesecovers I construct and apply in such a manner that, as well as acting asprotectors to the working parts, they retain some of them in position.The cover i' slides up between the guiders c c in front of the shortribs 1", and its lower part is turned over, so as to embrace the fiangec5 on the bottom of the body. The striking-socket n projects through ahole in this cover. The top cover, s, fits over the box part of thebody. Three of its sides are provided with fianges, and the fourth sideslides under the right-angle flange r2 on the cover r, thereby holdingand locking the cover o' in place. At the same time this end of thecover s is held down by the said flange r2. The other end of the cover sis held down by means of a pin, s', secured in the flange and arrangedVto fit into a hole formed in the end of the boX part of the body. Toprevent Ythe cover s from sliding forward a fiat spring, s?, is rivetedto its under side and catches over the inner edge of the body, passingthrough a slot, s3, (shown at Fig. 2,) as the cover is slid on the body.The end of this spring projects beyond the body, providing a means bywhich it may be raised When it is desired to remove the covers. Thiscover s holds the spring @Z7 down in the corner of the box part of thebody, and also prevents the shaft (Z5 of the pawl d from working out ofits bearings in the side of the box by means of the ears s", form- `ingparts of the flanges on the side of the cover. By this arrangement theemployment of pins and screws for holding the working parts in place isavoided, obviating the possibility of any of the parts becoming derangedwhen the machine is operated, and enabling the parts to be separated forthe purpose of cleaning, &c., without the necessity of using any othertool than the simple wrench em ployed for tightening the clamping-nutsof the legs, &c.

The improvements in the construction of the nut-frame e and half-nuts e2are clearly shown in Fig. 4. The half-nuts c`l surround the cylindricalpart of the body c, and are held in place by means of the lower part ofspring c, which causes them to embrace the screw (Z when the lever e isthrown back, as shown. The nuts and spring fit into the hollow nutframee, and the spring c3 is the only part se cured thereto by means of thetwo screws or rivets e5 c5.

To enable the drill f2 to be readily placed in and removed from thechuck secured to the end of the plunger j, this chuck consists of' thebody t and hinged cover t', having an open slot-ear, in which theeyebolt f" passes when the cover is closed down upon the drill-shank,

IOO

said eyebolt being provided with nuts, by

Worm-Wheel j, the Worm-cam j', the eompenw. sating-spring h4, and thespindle f', substantially as set forth.

2. In eombinatiomthe bell-Crank pawl d3, the ratchet-Wheel d2, theplunger f, the spring d6; and mechanism, substantially as described, bymeans of which the plunger is caused to reciprocate, as set forth.

3. The plunger f, compensating-spring h", and sliding head h, incombination With bellerank pawl d3, spring d, and ratchet-Wheel d2 onthe feedserew d, substantially as set forth.

4. In combination, the body c, the @over 1', provided with anges, andthe cover s, provided with flanges and retaining-spring s2 and pin s',substantially as and for the purposes set forth.

In Witness whereof l have hereunto set my hand, at New York, county andState of New` York, this 9th day of October, A. D. 1882. f ALFREDSHEDLOGK.

VitneSses J. H. -GREENSWARD,

l H. I). WILLIAMS.

